Trap makes and sizes are as personal a choice as what kind of woman you're in to. I'm a big fan of square jaw, dog on, Northwoods style coils in #2 for coyote, fox, badger, as well as the occasional bobcat. I baseplate and put a shock spring on them. Some are laminated and some aren't. The laminated traps get 4 coiled to keep them fast. For my strictly cat line I use #3 double long springs with big pans, baseplates, and a heavy twist link #3 chain set up. I've used MB550s. Not a huge fan of the pan tension situation, but it can be fixed. I have buddies that have regularly held wolves in MB650s. They're also great traps. Knowing how to trap and set up your traps is a lot more important than what brand or size you use.